This removes many references to the unsupported ProxyInfo struct but leaves temporary implementations for methods while downstream code gets updated. Bug: none Change-Id: Iab4410b362a8296b2e00cf71080010e515f9f4ba Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/344660 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42096}